High School

The atomic number of gold is 79, and the mass number of one of its isotopes is 197. What is the number of neutrons?

A. 79
B. 197
C. 118
D. 158

Answer :

Final answer:

The number of neutrons in a gold atom with a mass number of 197, we subtract the atomic number (79) from the mass number (197), giving 118 neutrons.

Explanation:

To calculate the number of neutrons in an atom, we subtract the atomic number (protons) from the mass number (protons + neutrons). In the case of gold with an atomic number of 79 and a mass number of 197 for one of its isotopes, the calculation would be 197 (mass number) - 79(atomic number). So the correct answer is (c) 118 neutrons.

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